Pitfall: The Mayan Adventure

Unlock the Lakamul Rain Forest level:
At the title screen, press A, L, A, R, A, L, Select, Select, Start.

Fly mode:
At the title screen, press L, Select, A, Select, R, A, L, Select. Start a game, hold Select and press Up, Down, Left or Right.

All weapons:
At the title screen, press L, Select, A, Select, R, A, L, Select. Start a game, hold Select and press B.

Show All The Levels:
At the Title screen, press L, Select, A, Select, R, A, L, Select. Press Select and R or L to scroll through the levels. Press Left to make the boomerang appear around the word Start.

Master code:
Press L, Select, A, Select, R, A, L, Select at the title screen to enable cheat mode.

Level select:
Enable the "Master code", then press L or R to select a level. Press Left to highlight "Start" to begin game play at the selected level.

Free movement:
Enable the "Master code", then begin game play on any level. Hold Select and press the D-pad during game play to move in any direction.

Nine continues:
Quickly and repeatedly press Start at the continue screen until the remaining number of continues increases to nine.